Electron impact ro-vibrational transitions and dissociative recombination of H2+ and HD+ - Rate coefficients and astrophysical implications

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Volume 703 (November 2025)

A&A, 703 (2025) A220

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Table 1

First 30 ro-vibrational levels of $H_{2}^{+}$ $\mathrm{H}_{2}^{+}$ and HD⁺.

	$H_{2}^{+}$ $\mathrm{H}_{2}^{+}$		HD⁺		$H_{2}^{+}$ $\mathrm{H}_{2}^{+}$			HD⁺
Num.	( $N_{i}^{+}, v_{i}^{+}$ $N_{i}^{+}, v_{i}^{+}$ )	energy (eV)	( $N_{i}^{+}, v_{i}^{+}$ $N_{i}^{+}, v_{i}^{+}$ )	energy (eV)	Num.	( $N_{i}^{+}, v_{i}^{+}$ $N_{i}^{+}, v_{i}^{+}$ )	energy (eV)	( $N_{i}^{+}, v_{i}^{+}$ $N_{i}^{+}, v_{i}^{+}$ )	energy (eV)
1	(0, 0)	0.000	(0, 0)	0.000	16	(10, 0)	0.371	(4, 1)	0.289
2	(1, 0)	0.007	(1, 0)	0.005	17	(5, 1)	0.372	(5, 1)	0.314
3	(2, 0)	0.021	(2, 0)	0.016	18	(6, 1)	0.412	(11, 0)	0.337
4	(3, 0)	0.043	(3, 0)	0.033	19	(11, 0)	0.44	(6, 1)	0.344
5	(4, 0)	0.071	(4, 0)	0.054	20	(7, 1)	0.457	(7, 1)	0.379
6	(5, 0)	0.106	(5, 0)	0.080	21	(8, 1)	0.507	(12, 0)	0.394
7	(6, 0)	0.148	(6, 0)	0.112	22	(12, 0)	0.512	(8, 1)	0.418
8	(7, 0)	0.195	(7, 0)	0.148	23	(0, 2)	0.528	(13, 0)	0.455
9	(8, 0)	0.249	(8, 0)	0.189	24	(1, 2)	0.534	(9, 1)	0.461
10	(0, 1)	0.272	(9, 0)	0.234	25	(2, 2)	0.547	(0, 2)	0.462
11	(1, 1)	0.279	(0, 1)	0.237	26	(9, 1)	0.563	(1, 2)	0.467
12	(2, 1)	0.292	(1, 1)	0.242	27	(3, 2)	0.566	(2, 2)	0.477
13	(9, 0)	0.307	(2, 1)	0.253	28	(13, 0)	0.589	(3, 2)	0.492
14	(3, 1)	0.312	(3, 1)	0.268	29	(4, 2)	0.592	(10, 1)	0.508
15	(4, 1)	0.339	(10, 0)	0.284	30	(5, 2)	0.623	(4, 2)	0.511

Notes. Energies are given for the first 30 ro-vibrational levels of the X² $X^{2} Σ_{g}^{+}$ $\mathrm{X}^{2} \Sigma_{g}^{+}$ electronic states of $H_{2}^{+}$ $\mathrm{H}_{2}^{+}$ and HD⁺, relative to the ground level $(N_{i}^{+}, v_{i}^{+}) = (0, 0)$ $\left(N_{i}^{+}, v_{i}^{+}\right)= (0, 0)$ .

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